/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hive.ql.udf;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;


@Description(
      name = "radians",
      value = "_FUNC_(x) - Converts degrees to radians",
      extended = "Example:\n" +
          "  > SELECT _FUNC_(90) FROM src LIMIT 1;\n" +
          "  1.5707963267949mo\n"
      )
public class UDFRadians extends UDF {

  @SuppressWarnings("unused")
  private static Log LOG = LogFactory.getLog(UDFRadians.class.getName());
  DoubleWritable result = new DoubleWritable();
  
  public UDFRadians() {
  }

  public DoubleWritable evaluate(DoubleWritable i)  {
    if (i == null) {
      return null;
    } else {
      result.set(Math.toRadians(i.get()));
      return result;
    }
  }

}
